The term 'Fully' is Wikipedia making up their own notability criteria (ironic obviously) to keep the numbers of articles created on the website at a contained level. If all Professional Sports People particularly in football the most played sport in the world were considered notable and could all potentially have articles created costs for Wikipedia would explode. Not just Sports this applies to obviously.
Still don't see any rational reason why/how Professional footballers who have competed at the highest level in a National football association domestic league or UEFA/FIFA sanctioned international competitions cannot be considered notable? Totally bizarre and discredits Wikipedia as a portal.
In fairness I remember before I gave up contributing the likes of that GiantSnowman clown were all over threatening deleting LOI club season articles and cup competition articles which luckily appear to have remained intact.
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